X PREFACE TO THE SECOND EDITION. 



4. Observations on the Nature and Destination of the Food of Animals ; principally 

 based on Prof. Liebig's views, $ 430434. 



5. Mr. Goodsir's researches on the absorbent Cells of the Intestinal Villi, 461, 462. 



6. Researches of Mr. Addison and M. Bourgery on the structure of the Lungs, 525. 



7. Researches of MM. Andral and Gavarret, and of Prof. Scharling, on Respiration, 

 . 534 note, and 544. 



8. The chapter on Nutrition, including the history of the Chyle, Blood and Tissues, 

 almost wholly re-written; so as to include the results of the most recent observations on 

 these subjects, and the views to which the Author has been led by them. 



9. The doctrine of Secretion by Cells, as developed by Henle,Goodsir and others, 651. 



10. The researches of Mr. Bowman on the structure and functions of the Malpighian 

 bodies of the Kidney, 667, 668. 



11. The account of the constitution of Urine lately given by Liebig, 673 678. 



"12. The inquiries of Dr. Lehmann, respecting the influence of diet on the constitution 

 of the Urinary Secretion, 679, 680. 



13. The researches of Dr. Evans on the structure of the Spleen, 708, 709. 



14. The inquiries of Dr. Buchanan on the changes in the Blood produced by admixture 

 of Chyle, 714 note, 715. 



15. The investigations of Chossat on the effects of Inanition, 730. 



16. The results of M. Raciborski's inquiries in regard to the relation between the 

 periods of Conception and Menstruation, 742. 



17. The researches of Dr. Ritchie, into the various conditions of the Ovaria, 744. 



Many other additions, not of sufficient importance to be thus specified, 

 are scattered throughout the work ; and in many instances these are the 

 result of the Author's own investigations. He has particularly directed, 

 his attention to the settlement of points which appeared to him to have 

 been left doubtful by others ; and hence will sometimes be found to 

 have expressed his views with a degree of confidence which the evi- 

 dence adduced by them may scarcely appear to warrant. 



Notwithstanding the attacks which have been made on Dr. Barry's 

 views respecting the Reproductive process, by Prof. Bischoff and Mr. 

 Wharton Jones, tl^Author has not felt it desirable to modify in any 

 great degree, t^e^^ount he had previously given of that Function, 

 chiefly on Dr. Barry's authority. It happens that he is well convinced, 

 by his own observations, of Dr. B.'s accuracy on some of the leading 

 points which have been most strongly objected to; and he feels the 

 more confidence, therefore, in regard to the rest. He may also advert to 

 the very remarkable confirmation, which has been afforded to Dr. B.'s 

 statements regarding the early changes that take place within the germi- 

 nal vesicle, by the parallel researches of Mr. H. S. Goodsir on the ova 

 of Acephalocysts (Trans, of Roy. Soc. of Edinb., vol. xv.). He cannot 

 but regret that the subject has been discussed with so much acrimony 

 of feeling, and with so much more desire to find fault than to elicit 

 Truth. 



In regard to certain subjects which have excited much attention since 

 the appearance of the First Edition, the Author may be permitted to 



